Thanos was Hollywood’s continued slander of Environmentalists via straw-men. They can not and will not portray any treat to the status quo as good because to succeed in Hollywood, you need to learn to navigate said status quo.

Musk isn’t far from Stark as Stark could have scaled up his Arc Reactor and made dirty energy obsolete, but didn’t the same way that Musk could run his businesses and treat his employees fairly, but chooses not to out of pure ego.